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[ARM] Convert some arm semaphores to mutexes

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The arm clock semaphores are strict mutexes, convert them to the new
mutex implementation

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Arjan van de Ven
2006-01-12 18:42:23 +00:00
committed by Russell King
parent f4619025a5
commit 00431707be
9 changed files with 67 additions and 58 deletions
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15
arch/arm/common/rtctime.c
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@ -18,6 +18,7 @@
#include <linux/miscdevice.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <asm/rtc.h>
#include <asm/semaphore.h>
@ -34,7 +35,7 @@ static unsigned long rtc_irq_data;
/*
* rtc_sem protects rtc_inuse and rtc_ops
*/
static DECLARE_MUTEX(rtc_sem);
static DEFINE_MUTEX(rtc_mutex);
static unsigned long rtc_inuse;
static struct rtc_ops *rtc_ops;
@ -355,7 +356,7 @@ static int rtc_open(struct inode *inode, struct file *file)
{
int ret;
down(&rtc_sem);
mutex_lock(&rtc_mutex);
if (rtc_inuse) {
ret = -EBUSY;
@ -373,7 +374,7 @@ static int rtc_open(struct inode *inode, struct file *file)
rtc_inuse = 1;
}
}
up(&rtc_sem);
mutex_unlock(&rtc_mutex);
return ret;
}
@ -479,7 +480,7 @@ int register_rtc(struct rtc_ops *ops)
{
int ret = -EBUSY;
down(&rtc_sem);
mutex_lock(&rtc_mutex);
if (rtc_ops == NULL) {
rtc_ops = ops;
@ -488,7 +489,7 @@ int register_rtc(struct rtc_ops *ops)
create_proc_read_entry("driver/rtc", 0, NULL,
rtc_read_proc, ops);
}
up(&rtc_sem);
mutex_unlock(&rtc_mutex);
return ret;
}
@ -496,12 +497,12 @@ EXPORT_SYMBOL(register_rtc);
void unregister_rtc(struct rtc_ops *rtc)
{
down(&rtc_sem);
mutex_lock(&rtc_mutex);
if (rtc == rtc_ops) {
remove_proc_entry("driver/rtc", NULL);
misc_deregister(&rtc_miscdev);
rtc_ops = NULL;
}
up(&rtc_sem);
mutex_unlock(&rtc_mutex);
}
EXPORT_SYMBOL(unregister_rtc);